Extra Coronal Provisional Restorations Flashcards
when is a temporary restoration provided
between tooth prep and fit of indirect restoration
what characteristics should provisional restorations have
restore tooth function
provide coronal seal
have good marginal fit
be well contoured
be cleanable
establish and maintain dental aesthetics
prevent sensitivity
prevent microleakage
confirm tooth prep is adequate
occlusal stability
preserve or improve function
what are the desirable characteristics of provisional materials
non-irritant
low temperature rise during setting
dimensionally stable
adequate working time
adequate setting time
adequate strength and wear resistance
good aesthetics
what are the types of provisional restoration
custom formed
preformed
what material is used for custom resin provisional crowns
bis acrylic composite resin
protemp
why do you make the temporary before impression for definitive restoration
to help check that tooth prep is satisfactory
what material is used to make a sectional impression for a temporary
addition cured silicone putty - best
alginate - cannot be reused, cheaper
softened modelling wax - cannot be reused
what is the method for custom resin provisional crowns
sectional impression
prepare tooth for chosen restorations
syringe bis acrylic composite resin material onto mixing pad
syringe material into sectional impression of tooth that has been prepared
relocate impression in the mouth
remove before complete polymerisation
remove completely
remove flash and ledges
confirm tooth prep
check marginal fit and occlusion
check aesthetics
cement provisional restoration
how do you establish occlusion and aesthetics if there is loss of original tooth form due to wear cases
pilot occlusion and aesthetics using provisionals
if patient happy then take impressions of provisional in situ
how do you establish guidance
produce on crowns via diagnostic wax up and study models and facebow
what are the problems with preformed crowns
unlikely to fit accurately
large bank of crowns needed
when are preformed provisional crowns useful
for situations where no impression is taken prior to tooth preparation or damage
what are polycarbonate crowns
tooth coloured shells with tooth morphology
what is the method for a preformed provisional crown
select shell slightly larger than preparation
trim back until correct dimensions and seats fully over tooth prep
fill shell with protemp
seat over tooth
allow polymerisation
remove
check fit
trim/tidy if necessary
cement
cut off tag
what teeth are metal preformed crowns used for
posterior teeth
